function isPC() {  
            var userAgentInfo = navigator.userAgent;  
            var Agents = new Array("Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod");  
            var flag = true;  
            for (var v = 0; v < Agents.length; v++) {  
                if (userAgentInfo.indexOf(Agents[v]) > 0) {  
                    flag = false;  
                    break;  
                }  
            }  
            return flag;  
}
const pc = isPC()